These are the latest versions of MPIDE available for each supported operating system. There are two groups - release and test. The release versions are officially released, whereas the test versions are builds we make as we go along to ensure that things are still working as we go.

Test Versions
These are the versions that are being updated regularly. If you need a new version, this is the version to get.

Release Versions
These are old versions, but they are the "official" versions. The test versions are generally better, as they contain newer code with more bugs fixed. These release versions are here if you need them though.